Not all cities or states require licenses. Check with your local or state Department of Labor. For information regarding pesticide application licenses, sometimes needed when antimicrobial products are being used, click here.

Many NADCA members provide residential and commercial services. However, some companies provide just one. If a company has just recently entered the commercial HVAC cleaning industry, they should be able to highlight recent training and education they have received.

Each member of NADCA has one ASCS on staff; some have more than one. Many specifications require the presence of an ASCS. This certification signifies a high level of professionalism in the HVAC cleaning industry.